3 files changed, 19 insertions, 25 deletions
diff --git a/src/construct/heading_atx.rs b/src/construct/heading_atx.rs
index c867117..ca100c8 100644
--- a/src/construct/heading_atx.rs
+++ b/src/construct/heading_atx.rs
@@ -127,20 +127,17 @@ pub fn sequence_open(tokenizer: &mut Tokenizer) -> State {
         tokenizer.tokenize_state.size += 1;
         tokenizer.consume();
         State::Next(StateName::HeadingAtxSequenceOpen)
-    } else if tokenizer.tokenize_state.size > 0 {
-        if matches!(tokenizer.current, None | Some(b'\n')) {
-            tokenizer.tokenize_state.size = 0;
-            tokenizer.exit(Name::HeadingAtxSequence);
-            State::Retry(StateName::HeadingAtxAtBreak)
-        } else if matches!(tokenizer.current, Some(b'\t' | b' ')) {
-            tokenizer.tokenize_state.size = 0;
-            tokenizer.exit(Name::HeadingAtxSequence);
-            tokenizer.attempt(State::Next(StateName::HeadingAtxAtBreak), State::Nok);
-            State::Retry(space_or_tab(tokenizer))
-        } else {
-            tokenizer.tokenize_state.size = 0;
-            State::Nok
-        }
+    }
+    // Always at least one `#`.
+    else if matches!(tokenizer.current, None | Some(b'\n')) {
+        tokenizer.tokenize_state.size = 0;
+        tokenizer.exit(Name::HeadingAtxSequence);
+        State::Retry(StateName::HeadingAtxAtBreak)
+    } else if matches!(tokenizer.current, Some(b'\t' | b' ')) {
+        tokenizer.tokenize_state.size = 0;
+        tokenizer.exit(Name::HeadingAtxSequence);
+        tokenizer.attempt(State::Next(StateName::HeadingAtxAtBreak), State::Nok);
+        State::Retry(space_or_tab(tokenizer))
     } else {
         tokenizer.tokenize_state.size = 0;
         State::Nok
diff --git a/src/construct/label_end.rs b/src/construct/label_end.rs
index ca71245..d48f0c5 100644
--- a/src/construct/label_end.rs
+++ b/src/construct/label_end.rs
@@ -624,16 +624,13 @@ pub fn reference_full_after(tokenizer: &mut Tokenizer) -> State {
 ///        ^
 /// ```
 pub fn reference_collapsed(tokenizer: &mut Tokenizer) -> State {
-    match tokenizer.current {
-        Some(b'[') => {
-            tokenizer.enter(Name::Reference);
-            tokenizer.enter(Name::ReferenceMarker);
-            tokenizer.consume();
-            tokenizer.exit(Name::ReferenceMarker);
-            State::Next(StateName::LabelEndReferenceCollapsedOpen)
-        }
-        _ => State::Nok,
-    }
+    // We only attempt a collapsed label if there’s a `[`.
+    debug_assert_eq!(tokenizer.current, Some(b'['), "expected opening bracket");
+    tokenizer.enter(Name::Reference);
+    tokenizer.enter(Name::ReferenceMarker);
+    tokenizer.consume();
+    tokenizer.exit(Name::ReferenceMarker);
+    State::Next(StateName::LabelEndReferenceCollapsedOpen)
 }
 
 /// In reference (collapsed), at `]`.
diff --git a/src/construct/partial_space_or_tab.rs b/src/construct/partial_space_or_tab.rs
index 198dae2..6c5c0ca 100644
--- a/src/construct/partial_space_or_tab.rs
+++ b/src/construct/partial_space_or_tab.rs
@@ -96,7 +96,7 @@ pub fn start(tokenizer: &mut Tokenizer) -> State {
         if tokenizer.tokenize_state.space_or_tab_connect {
             let index = tokenizer.events.len() - 1;
             link(&mut tokenizer.events, index);
-        } else if tokenizer.tokenize_state.space_or_tab_content.is_some() {
+        } else {
             tokenizer.tokenize_state.space_or_tab_connect = true;
         }